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$55The Economist Feb 12, 2000
$55The Economist Jul 29, 2000
$55The Economist Jun 2, 2001
$55The Economist Sep 15, 2001
$55The Economist Jan 12, 2002
$55The Economist Sep 17, 2002
$55The Economist Oct 19, 2002
$55The Economist Jun 21, 2003
$55The Economist Aug 23, 2003
$55The Economist Sep 13, 2003
$55The Economist Nov 1, 2003
$55The Economist Nov 15, 2003
$55The Economist Feb 7, 2004
$55The Economist May 22, 2004
$55The Economist Jun 12, 2004
$55The Economist Aug 21, 2004
$55The Economist Sep 11, 2004
$55The Economist Nov 20, 2004
$55The Economist Jan 29, 2005
$55The Economist Feb 12, 2005
$55The Economist Feb 19, 2005
$55The Economist Mar 5, 2005
$55The Economist Aug 13, 2005
$55The Economist Dec 24, 2005
$55The Economist Aug 20, 2005
$55The Economist Jan 28, 2006
$55The Economist Feb 11, 2006
$55The Economist Mar 11, 2006
$55The Economist Jun 24, 2006
$55The Economist Aug 12, 2006
$55The Economist Sep 2, 2006
$55The Economist Sep 16, 2006
$55The Economist Nov 11, 2006
$59Scientific American Feb 1, 1955
$59Scientific American Mar 1, 1955
$59Scientific American Apr 1, 1955
$59Scientific American Aug 1, 1955
$59Scientific American Jul 1, 1958
$59Scientific American Aug 1, 1958
$59Scientific American Jan 1, 1959
$59Scientific American Feb 1, 1959
$59Scientific American Mar 1, 1959
$59Scientific American Apr 1, 1959
$59Scientific American Jul 1, 1959
$59Scientific American Aug 1, 1959
$59Scientific American Sep 1, 1959
$59Scientific American Oct 1, 1959
$59Scientific American Dec 1, 1959
$40Scientific American Nov 1, 2011
$40Scientific American May 1, 2012
$55The Economist Dec 21, 1991
$55The Economist Jun 6, 1992
$55The Economist Mar 13, 1993
$55The Economist Jun 19, 1993
$55The Economist Jul 3, 1993
$50LIFE Dec 23, 1957
$40LIFE Nov 24, 1958
$40LIFE Mar 25, 1957
$40LIFE Mar 4, 1957
$40LIFE Jan 7, 1957